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Mitchell Hashimoto × Zed — Agentic Engineering in Action (2025)

Source: YouTube · zed-editor Agentic Engineering Sessions #1 · ~1h01m · 2025-06-18

Navigation map into the wiki. Not a summary (see Telegram summary); a source-index query page.

Threads

  • Raise the quality bar, don't just ship faster. Positions Ghostty work as high-quality-bar agentic engineering, not vibe-coding → agentic-engineering, ghostty
  • The architect stays human. Mitchell owns structure/data flow, agent fills in the shape → mitchell-hashimoto, agent-as-junior-engineer
  • Agent-as-junior-engineer analogy. Execution is fine; senior judgment (regression-safe fixes, maintainability, team-legibility) is the gap → agent-as-junior-engineer
  • Driving-into-mud failure mode. Long vague sessions collapse; each iteration slower than the last → driving-into-mud
  • Snapshot-first workflow with jujutsu. Cheap rewinds between agent steps without commit ceremony → jujutsu
  • GitHub-issue triage slash command. Pulls issue, explains cause, proposes path, does not fix → claude-code, agent-as-junior-engineer
  • Parallel agent competitions. ghostty-2/3/4/ clones, same prompt, different models, pick the winner → parallel-agent-competitions
  • TDD for bugs. Failing test first, agent fixes to pass → agentic-engineering
  • Disable self-tests when verification is impossible. Ghostty-Mac has no screenshot/build loop → ghostty, claude-code
  • Zig is the hardest case. Workaround: draft solution in Python/C/Rust first, hand-port → ghostty, jagged-intelligence
  • Low-level invariants confuse models. Fixed-size virtual memory pages + 16-bit offsets get rewritten into textbook code, destroying perf → ghostty, jagged-intelligence
  • ~25% of recent Ghostty code is AI-assisted (last two months, June 2025 baseline). <1% across the whole project → mitchell-hashimoto

People & tools

Contribution to the wiki

New entity pages: mitchell-hashimoto, ghostty, zed-editor, claude-code, jujutsu New concept pages: agent-as-junior-engineer, driving-into-mud, parallel-agent-competitions (Reinforces and cross-links existing agentic-engineering, vibe-coding, jagged-intelligence.)